(a)[2]
State the meaning of a photon.
(b)[3]
It has been found that, when photoelectric emission of electrons occurs, there is virtually no time lag between shining light on the surface and an electron being released. State three further pieces of evidence from the photoelectric effect that show electromagnetic radiation has a particulate nature.
(c)[3]
A metal surface has a work function of $3.5\,\text{eV}$. Light of wavelength $450\,\text{nm}$ is incident on the surface. Determine whether electrons will be emitted from the surface by the photoelectric effect.